function createSelect(select_container) {
			//创建select容器，class为select_box，插入到select标签前
			var tag_select = $('<div></div>'); //div相当于select标签
			tag_select.attr('class', 'select_box');
			tag_select.insertBefore(select_container);
			//显示框class为select_showbox,插入到创建的tag_select中
			var select_showbox = $('<div></div>'); //显示框
			select_showbox.css('cursor', 'pointer').attr('class', 'select_showbox').appendTo(tag_select);
			//创建option容器，class为select_option，插入到创建的tag_select中
			var ul_option = $('<ul></ul>'); //创建option列表
			var ul_optionp = $('<p></p>')
			ul_option.attr('class', 'select_option');
			ul_option.appendTo(tag_select);
			ul_optionp.appendTo(ul_option)
			createOptions(select_container, ul_option); //创建option
			//点击显示框
			tag_select.mouseover(function(event) {
				ul_option.show();
			});
			tag_select.mouseout(function(event) {
				ul_option.hide();
			});
			var li_option = ul_option.find('li');
			li_option.on('click', function() {
				$(this).addClass('selected').siblings().removeClass('selected');
				var value = $(this).text();
				select_showbox.text(value);
				ul_option.hide();
			});
			li_option.hover(function() {
				$(this).addClass('hover').siblings().removeClass('hover');
			}, function() {
				li_option.removeClass('hover');
			});
		}
		function createOptions(select, ul_list) {
			//获取被选中的元素并将其值赋值到显示框中
			var options = select.find('option'),
				selected_option = options.filter(':selected'),
				selected_index = selected_option.index(),
				showbox = ul_list.prev();
			showbox.text(selected_option.text());
			//为每个option建立个li并赋值
			for (var n = 0; n < options.length; n++) {
				var tag_option = $('<li></li>'), //li相当于option
					txt_option = options.eq(n).text();
				tag_option.text(txt_option).css('cursor', 'pointer').appendTo(ul_list);
				//为被选中的元素添加class为selected
				if (n == selected_index) {
					tag_option.attr('class', 'selected');
				}
			}
		}
